Magnetic disc reading head having reduced friction with a floppy disk

Abstract

A floppy disk system is provided which includes a pair of magnetic heads each consisting of a slider with which a magnetic disk moves in contact and a magnetic core which is formed in the slider and has formed therein a magnetic gap. The magnetic heads holds the magnetic disk therebetween to record or reproduce information signals on or from the magnetic disk. The disk contact surface of each of the sliders is polished to have a surface roughness of 2 to 8 nmRa for avoiding the stick-slip between the magnetic heads and the magnetic disk, thereby decreasing the start torque of a spindle motor required for rotating the disk.

What is claimed is: 
     
       1. A manufacturing process for a magnetic head of a floppy disk system comprising the steps of: preparing a magnetic head including a slider and a magnetic core made of a soft magnetic material, the slider and the magnetic core having surfaces with which a magnetic disk contacts for recording and reproducing information signals on or from the magnetic disk; and   lapping the surfaces of the slider and the magnetic core together to have a surface roughness of 3 to 8 μm.   
     
     
       2. A manufacturing process as set forth in claim 1, wherein the surfaces of the slider and the magnetic core together are lapped with one of a chromic acid abrasive powder and a diamond powder having a grain size of approximately 2 to 8 μm. 
     
     
       3. A manufacturing process as set forth in claim 1, wherein the slider and the magnetic core are made of materials having substantially the same hardness. 
     
     
       4. A manufacturing process as set forth in claim 3, wherein the materials of the slider and the magnetic core have a hardness within a range of 600 to 800 Hv.